I ran into that POI difference with my threaded barrel but just figured it was part of the bubbafied gun it came in. I put it in my other CZ52 but havnt had a chance to see if it's the bubba sights or the gun. Literally bought a gun for the barrel as it's the only threaded barrel for the CZ 52 I've ever seen. I know makarov.com used to make them but they are long gone. I think mine is a M13x1.25 but I havnt gotten around to confirming that. Once I do I'll just get a tap and make a 1/2-28 adapter. I can just about put a .30cal firearm sideways on my hybrid and it'll clear the baffles.Mine is 1/2x28 and is one of my spare barrels. (I also have the 9mm conversion barrel.) My threaded barrel does not shoot in line with the sights very well.
My POI shift in the ghost ring gun is vertical.
I wonder if a 52 will cycle with my Tokarev subs?!?!